Comment utiliser le buffer-z ?

Version imprimable

Salut, je débute en OpenGl(et glut) et je suis déjà bloquer, j'ai essayer de faire un cube, mais les faces ce chevauche. Je sais que pour éviter ce problème il faut utiliser le buffer-z, mais comment l'utiliser sans windows.h ?
Voici mon code:

Code:

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#include <gl/glut.h>
 
void Clavier(unsigned char touche,int x,int y);
void Reshape(int w, int h);  
void Affichage();  
 
int main( int argc, char** argv)
{   
    glutInit(&argc, argv);
 
    glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
    glutInitWindowSize(250, 250); 
    glutInitWindowPosition(500, 300);  
 
    glutCreateWindow("OpenGL");
    glClearColor(0.0,0.0,0.0,0.0);
    glutReshapeFunc(Reshape);
    glutDisplayFunc(Affichage);
	glutKeyboardFunc(Clavier);
    glutMainLoop();
    return 0;
}
 
void Affichage()
{ 
 glClear(GL_COLOR_BUFFER_BIT);
 glMatrixMode(GL_MODELVIEW) ;
 glLoadIdentity();
 
 gluLookAt(7,7,-10,0,0,0,0,1,0);
 
			glBegin (GL_QUADS); 
			glColor3d(1.0f, 0.f, 0.0f);
				glVertex3i (-1,-1,1); // 1
			glColor3d(0.0f, 1.f, 0.0f);
				glVertex3i (-1,1,1);
			glColor3d(0.0f, 0.f, 1.0f);
				glVertex3i (1,1,1);
			glColor3d(1.0f, 1.f, 1.0f);
				glVertex3i (1,-1,1);
			glColor3d(1.0f, 0.f, 0.0f);
				glVertex3i (-1,-1,-1); // 2
			glColor3d(0.0f, 1.f, 0.0f);
				glVertex3i (-1,1,-1);
			glColor3d(0.0f, 0.f, 1.0f);
				glVertex3i (1,1,-1);
			glColor3d(1.0f, 1.f, 1.0f);
				glVertex3i (1,-1,-1);
			glColor3d(1.0f, 0.f, 0.0f);
				glVertex3i (-1,1,-1); // 3
			glColor3d(0.0f, 1.f, 0.0f);
				glVertex3i (1,1,-1);
			glColor3d(0.0f, 0.f, 1.0f);
				glVertex3i (1,1,1);
			glColor3d(1.0f, 1.f, 1.0f);
				glVertex3i (-1,1,1);
			glColor3d(1.0f, 0.f, 0.0f);
				glVertex3i (-1,-1,-1); // 4
			glColor3d(0.0f, 1.f, 0.0f);
				glVertex3i (1,-1,-1);
			glColor3d(0.0f, 0.f, 1.0f);
				glVertex3i (1,-1,1);
			glColor3d(1.0f, 1.f, 1.0f);
				glVertex3i (-1,-1,1);
			glColor3d(1.0f, 0.f, 0.0f);
				glVertex3i (-1,-1,-1); // 5
			glColor3d(0.0f, 1.f, 0.0f);
				glVertex3i (-1,-1,1);
			glColor3d(0.0f, 0.f, 1.0f);
				glVertex3i (-1,1,1);
			glColor3d(1.0f, 1.f, 1.0f);
				glVertex3i (-1,1,-1);
			glColor3d(1.0f, 0.f, 0.0f);
				glVertex3i (1,-1,-1); // 6
			glColor3d(0.0f, 1.f, 0.0f);
				glVertex3i (1,-1,1);
			glColor3d(0.0f, 0.f, 1.0f);
				glVertex3i (1,1,1);
			glColor3d(1.0f, 1.f, 1.0f);
				glVertex3i (1,1,-1);
			glEnd();
	glFlush();
	//glutFullScreen();
 
 glutSwapBuffers();
}
 
 
void Reshape(int w, int h) 
{
   glMatrixMode(GL_MODELVIEW); 
   glLoadIdentity();
   glViewport(0,0,w,h);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   gluPerspective(45,(float) w/h,1.,500.);
}
 
void Clavier(unsigned char touche,int x,int y)
{
	switch (touche)
	{
		case 'd':
		glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
		glutPostRedisplay(); break;
		case 'w':
		glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
		glutPostRedisplay(); break;
		case 's' :
		glPolygonMode(GL_FRONT_AND_BACK,GL_POINT);
		glutPostRedisplay(); break;
		case 'a' :
		glutFullScreen(); break;
		case 'q' :
		exit(0);
	}
}

30/11/2008, 19h42
kremvax

Il faut que tu ajoutes GLUT_DEPTH dans les paramètres de glutInitDisplayMode
Et quand tu réinitialises l'affichage à chaque frame, réinitialises aussi le depth-buffer (depth buffer = z-buffer) :

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

Ouais ! Merci, ça marche !

J'ai un autre problème, c'est pour faire une translation d'un cude sur l'axe Z. Je ne sais pas ou mettre

Code:

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if (a <= -8) ecranComplet = 0; 
if (a >= 8) ecranComplet = 1; 
if (!ecranComplet) a += 0.1; 
if (ecranComplet) a -= 0.1; 
glTranslated (0,0,a);

Code complet:

Code:

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#include <gl/glut.h>
#include <string.h>
 
void bitmap_output(int x,int y,char *string,void *font);
void Clavier(unsigned char touche,int x,int y);
void Reshape(int w, int h);  
void Affichage();  
 
double a = 1;
int ecranComplet;
 
int main( int argc, char** argv)
{   
    glutInit(&argc, argv);
 
    glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
    glutInitWindowSize(250, 250);
    glutInitWindowPosition(500, 300);
 
    glutCreateWindow("OpenGL");
    glClearColor(0.0,0.0,0.0,0.0);
	glEnable(GL_DEPTH_TEST);
    glutReshapeFunc(Reshape);
    glutDisplayFunc(Affichage);
	glutKeyboardFunc(Clavier);
 
    glutMainLoop();
    return 0;
}
 
void Affichage()
{ 
 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 glMatrixMode(GL_MODELVIEW) ;
 glLoadIdentity();
 
 gluLookAt(0,0,-10,0,0,0,0,1,0);
 
if (a <= -8) ecranComplet = 0; 
if (a >= 8) ecranComplet = 1; 
if (!ecranComplet) a += 0.1; 
if (ecranComplet) a -= 0.1; 
glTranslated (0,0,a);
 
				glBegin (GL_QUADS); 
				glColor3d (0,1,1);glVertex3i (-3,-3,3);
				glColor3d (1,0,0);glVertex3i (-3,3,3);
				glColor3d (0,1,0);glVertex3i (3,3,3);
				glColor3d (1,0,1);glVertex3i (3,-3,3);
 
				glColor3d (0,0,1);glVertex3i (-3,-3,-3);
				glColor3d (1,1,0);glVertex3i (-3,3,-3);
				glColor3d (1,1,1);glVertex3i (3,3,-3);
				glColor3d (.5,.5,.5);glVertex3i (3,-3,-3);
 
				glColor3d (1,1,0);glVertex3i (-3,3,-3);
				glColor3d (1,1,1);glVertex3i (3,3,-3);
				glColor3d (0,1,0);glVertex3i (3,3,3);
				glColor3d (1,0,0);glVertex3i (-3,3,3);
 
				glColor3d (0,0,1);glVertex3i (-3,-3,-3);
				glColor3d (.5,.5,.5);glVertex3i (3,-3,-3);
				glColor3d (1,0,1);glVertex3i (3,-3,3);
				glColor3d (0,1,1);glVertex3i (-3,-3,3);
 
				glColor3d (0,0,1);glVertex3i (-3,-3,-3);
				glColor3d (0,1,1);glVertex3i (-3,-3,3);
				glColor3d (1,0,0);glVertex3i (-3,3,3);
				glColor3d (1,1,0);glVertex3i (-3,3,-3);
 
				glColor3d (.5,.5,.5);glVertex3i (3,-3,-3);
				glColor3d (1,0,1);glVertex3i (3,-3,3);
				glColor3d (0,1,0);glVertex3i (3,3,3);
				glColor3d (1,1,1);glVertex3i (3,3,-3);
				glEnd();
	glFlush();
	//glutFullScreen();
 
 glutSwapBuffers();
}
 
 
void Reshape(int w, int h) 
{
   glMatrixMode(GL_MODELVIEW); 
   glLoadIdentity();
   glViewport(0,0,w,h);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   gluPerspective(45,(float) w/h,1.,500.);
}
 
void Clavier(unsigned char touche,int x,int y)
{
	switch (touche)
	{
		case 'd':
		glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
		glutPostRedisplay(); break;
		case 'w':
		glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
		glutPostRedisplay(); break;
		case 's' :
		glPolygonMode(GL_FRONT_AND_BACK,GL_POINT);
		glutPostRedisplay(); break;
		case 'a' :
		glutFullScreen(); break;
		case 'q' :
		exit(0);
	}
}

Ca compile, mais ne fait absolument rien !
Pourquoi ?

01/12/2008, 00h54
LittleWhite

Je ne suis pas sur ... mais après 10 minutes de recherche je pense que tu devrais essayer ça :

Code:

glutIdleFunc(Affichage);

après la fonction glutDisplayFunc();

Mais je n'en suis pas sur ... :|

GLUT , lorsqu'il n'a rien à faire , il va appeler la fonction passer dans glutIdleFunc ( soit réaffichage de ta scène ... au sinon , comme le cas présent , il reaffiche pas , donc le cube bouge pas )